18814821 has 8 divisors (see below), whose sum is σ = 25109280. Its totient is φ = 12531792.

The previous prime is 18814819. The next prime is 18814847. The reversal of 18814821 is 12841881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18814821 - 2¹ = 18814819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18814811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2335 + ... + 6563.

It is an arithmetic number, because the mean of its divisors is an integer number (3138660).

Almost surely, 2^18814821 is an apocalyptic number.

It is an amenable number.

18814821 is a deficient number, since it is larger than the sum of its proper divisors (6294459).

18814821 is a wasteful number, since it uses less digits than its factorization.

18814821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5715.

The product of its digits is 4096, while the sum is 33.

The square root of 18814821 is about 4337.6054454042. The cubic root of 18814821 is about 265.9704350279.

The spelling of 18814821 in words is "eighteen million, eight hundred fourteen thousand, eight hundred twenty-one".